SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '113c20d544ba8c1a4e0e403a6bc745a8529f111ea755014424e14d98fd46d83a' 
  AND token = 'ZlIwcwt5PGRv7aqMH3zUK/pVXa5cnjRhgXwMPwdnazg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}